www/squid: Fix build with GSSAPI options
In some circumstances squid's configure script cannot detect properly which
GSSAPI is being used to build with and break build. Applied patch from
upstream ticket and also passes path of desired krb5-config to be used
during build
PR: 236959
Approved by: maintainer timeout (2 weeks)
Obtained from: https://bugs.squid-cache.org/show_bug.cgi?id=4933 (based on)
Sponsored by: Rubicon Communications, LLC (Netgate)